AFR Cylinder Heads

Custom Piston Worksheet & Order Form (pdf)

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AFR Cylinder Heads_Chevrolet Small Block_23°_LT1/LT4_Reverse Cooling_227cc_Competition Head_Angle Plug_65cc_Assembled

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Price $3,175.00

Product Code: AFR-1126

Description

Technical Specs

AFR 227cc "Race Ready" and "Competition" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. This head features 60/40 valve spacing and requires shaft mount rocker arms for optimum valve train geometry (can be used with .050 offset intake rockers for drag race only applications). AFR heads are available bare (without parts), call our tech line for details

227cc CNC Ported Intake Runners
A356 Aluminum
8 mm Bronze Valve guides
5 angle valve job
Precision CNC machining
Multiple spring options

Assembled heads feature:

8mm Bead Lock Valves
PAC Racing Valve Springs
ARP 7/16 Rocker Studs
Adjustable Guide Plates

www.P65Warnings.ca.gov

Description
Item Code	AFR-1126
Vendor	Air Flow Research
Product Type	Cylinder Heads
Product Model	Competition
Engine Family	Chevrolet - LT4
Weight	68

Included Components

Combustion Chamber	100% CNC Ported
Intake Ports	100% CNC Ported
Exhaust Ports	100% CNC Ported
Intake Valves	8mm Bead Lock Intake Valve - 2.100 x 5.000 Overall Length
Exhaust Valves	8mm Bead Lock Intake Valve - 1.600 x 5.030 Overall Length
Valve Springs	PAC Racing Spring - 1.550 OD - Solid Roller Dual Valve Spring - 220 lbs on seat - .710 maximum lift - Max RPM 7200 to 7400 Max RPM
Retainers	10° Manley Chrome Moly - 1.500 OD x 1.120 ID x .705 ID
Keepers	10° Bead Lock
Rocker Studs	7/16 ARP
Guide Plates	5/16 Adjustable
Valve Seals	.600 OD x .495 ID
Spring Seat Cups	1.550 OD x .705 ID - Hardened
Intake Valve Seat	Ductile Iron - 2.200 OD x 1.750 ID x .375 Deep
Exhaust Valve Seat	Ductile Iron - 1.696 OD x 1.325 ID x .305 Deep
Valve Guides	8 mm Bronze - .502 OD x 2.100 Overall Length

Recommended Components

Intake Gasket	AFR 6860
Note	Important: Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes.
Exhaust Gasket	Fel-Pro 1405
Head Gasket	Fel-Pro 1074
Head Bolts	ARP 134-3701
Head Studs	ARP 234-4301
Head Bolt Washers	Manley
Stud Girdle	AFR 6208
Intake Manifold	GM LT4 or Edelbrock LT4
Spark Plug Starting Range	Autolite 3922

Specifications and Features

Material	A356 Aluminum
Intake Port Volume	227cc
Intake Port Dimension	2.200 Height x 1.290 Width - 5/16 Radius
Intake Port Location	Stock
Exhaust Port Volume	80cc
Valve Job	Competition 5 Angle
Exhaust Port Dimension	1.430 Height x 1.540 Width
Exhaust Port Location	Raised .250
Combustion Chamber Volume	65cc
Valve Cover Bolt Pattern	Center or Perimeter Bolt - Factory accessory bolts and center bolt valve covers need to be shortened 3/16 to avoid bottoming out
Valve Angle	23°
Valve Spring Pocket Diameter	1.580 OD
Max Valve Spring Pocket Machining	1.680 OD
Note	Warning: Do not increase spring pad depth
Deck Thickness	.750
Minimum Bore Diameter	4.000
Flat Mill	.006 per cc 60cc Maximum
Angle Mill	.009 per cc 55cc Maximum
Note	Angle milling may require .120 thick intake gasket
Minimum Cross Sectional Area	2.340 sq in
Spark Plug Dimensions	14mm x .750 w/Gasket Seat
CARB EO	Not Emissions Compliant

Flow Chart
Flow Data: cfm @ 28 inches of Water

Lift	.200	.300	.400	.500	.550	.600	.650	.700	.750
Intake	152	212	265	300	312	319	324	327	329
Exhaust	120	167	214	230	234	238	241	243	245

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